Commutator-slotter.



F. S. WALTERS. commumoa SLOTTER. APPLICATION FILED JAN. 7, I914.

I Patented Oct. 15, 1918.

UNITED STATES. PATENT OFFICE.

FRANCIS S WAL'IEBS,

VANIA.

vented a new and useful Improvement in Commutator-Slotters, of whic the followinglis a specification.

y invention relates to, cutting tools and it has special reference to devices of this character which are adapted for cutting the insulation between the commutator bars of dynamo-electric machines.

The object of my mvention is to provide a simple and effective device for the purose named, that may be'readily adjusted or use with various sizes of commutator cylinders and that is light and compact.

, Theba'rs or segments of commutator cylinders for dynamo-electric machines are generally separated by sheets of mica or other hard, heat-resisting insulating material, in

a order that the cylinders may not be injured when subjected to high temperatures.

The insulating sheets are sometimes flush with the outer surface of the commutator cylinder, but, under certain conditions of service, where the wear on the commutator is likely to be excessive, better results, as regards commutation, may be secured by cutting the insulation to form shallow grooves in the cylinder between the bars. L

The bars and intermediate layers of insulation are substantially parallel to the axis of the cylinder, but occasionally they become displaced or skewed relatively to the axis,

According to my present invention, provide a reciprocable cutting tool havmg a guide which may be adjusted at any desired angle to the axis of the commutator cylinder in order that the cutting tool may follow the insulation, between the bars. My device is'supported in such manner as to be adaptable for mounting on various supports, such, for instance, as, the tool carriage off a lathe or the-brushholder' rods of. a dynamo electric machine.

My invention is ilustrated in the accompeering ra n n which igu e 1 shows the device mounted on alathe, portionsonly 0t which are shown; Fig, 2 is a plan view of the device; Fig. 3 is a side elevation, partially in section, of the device shown in Fig; andFig. & is an end view of the same.

' Referr ng to the drawings, the device here OF WILKINSBURG, PENNSYLVANIA, ASSIGNOB, TO WESTING- HOUSE ELECTRIC AND MANUFACTURING COMPANY,

coumu'raron-snor'rea.

Specification of Letters Patent. Application filed January 7,1914. Serial 110. 810,784.

shown comprises a cutting tool 1' of the groove Sina carriage 9, and,.dur1ng the cutn p 0 nas t sides;

about the pivotal Patented Oct. 15, 1918.

planer type, the thickness of which corresponds to that of the insulation 2 between bars 3 of a commutator cylinder 4.

The tool 1 is mounted inan inclined slot 5 in a clapper box 6 in which it is rigidly maintained by a screw 7. The inclination of the tool 1, by which the cutting point is placed forward and clear of the carriage, permits a clean out throughout the entire length of the insulation and eliminates the necessity of cutting out by hand small por tions of insulation next to the commutator risers. In the usual commutator slotting machines, it has been necessary to remove the insulation near the commutator risers by hand, inasmuch'as the cutting tools would not permit of its removal in the regular cuttin operation. a a

he clapper box 6 is pivotally mounted at an intermediate point upon a pin 10 in a ting stroke, is held rigidly by reason of its en agement with a face 11 of the groove -8, and is adapted to be given a rotative movement about the pin .10 against the action of a spring 12 on the return stroke, inorder that the tool point may yield during its return stroke and be raised if necessary out of the cut. The spring 12 is located in an aperture 14 in the carriage 9 and is inter posed between the carriage I of-the clapper box 6 opposite to that in which the cutting tool is mounted. V

The base of the carriage 9, which is laterally and longitudinally extended for the pur se of providing an adequate bearing sur ace, is rovided with a groove 17to re"- ceive a gui e or bed plate 18. A handle 19 that is screwed into the side of the carriage 9, provides means by which the carriage maybe moved back and forth over the bed plate 18..

to a ba P a e 19 y a cr w idedt a ts' pp s wend, th a s 2 hr ugh which passes a screw 22 y o which it may be clam to he base Plat-Q 1 The base-pl 20 and '1 PW 19 isflprovided, at one e y with. gs or bra as 2 1 m j r ep n o adjusting a e 26,; the e s o wh h. ng g t e edges at the bed plate 18. By manipulating the screws 26, the bed plate 18 may be moved point, provided by the 9 and the end a co'nronurolv or rmms'zti "The bed Plate 18 is b voted, at one, end, i

screw 20, and rigidly fixed parallel to or at ferred embodiment of myinvention and aany desired an le relative to the axis of the particular adaptation thereof, the structural commutator ey inder. details and arrangement of parts may obvi- 5 The base late 19 is rigidly supported ously be varied materially without depart upon a stan ard or bracket 27 b bolts 28 ing from the spirit and scope of'my invenwhich extend into holes 29 in the ase plate. tion, and such modifications are intended A plurality of the holes 29 are provided to to be covered by the appended claims.

permit the placing of the base plate in any 0 aim as my invention: 55 one of several positionson the standard or 1. A cutting device'for commutator inbracket 27. sulation comprising a reciprocable -tool supshown in Fig. 1, the standard or port, a guide therefor, -abase upon whichbracket 27 'is clamped to a tool post 30 of the guide is pivotally supported, and screws a lathe, portions only of which are shown, associated with the said base and engaging and adjusted so as to bring the cutting point t c said guide for maintaining .the said 15 of the, tool 1 in alinement with one of the guide in adjustable position. 4 strips of insulation 2 in the commutator 2. cutting device for commutator incylinder 31 of an armature 32. T e armasulation including a base, a guide restin ture shaft 33 is engaged, at its ends, by throughout substantially its entire lengt head and tail spindles 34 and 35, respecupon the ase, means for adjusting the 20. tively, and held in position thereby. guide angularly with respect to the baseand en the device is in position, as shown a tool support reciprocally mounted upon in Fig. 1, the cutting operation is performed the guide. a by t e operator graspingthe'handle 19 3. A cutting device for commutator inand pressing to the right. The tool passes sulation including a supporting base, a 25 through the ed e of one of the layers of guide having pivoted connectionwith theinsulation 2 an makes the out. With the base and resting throughout substantially return stroke of the handle 19, the tool is its entire length against the base, means for permitted to yield and to withdraw, if necesadjusting the guide angularly-with respect 30 a ove, thus avoiding unnecessary friction position and a tool support reciprocally on the tool point and conserving the lifeof mounted upon the guide. the tool. lVhen one out has beenmade, the 4. A cutting device for commutator innext strip of insulation is brought into posulation including a base, a guide pivoted sition for cutting by rotating-the" commuat one end to the base, means cooperating 35 tator cylinder about its axis in the lathe. etween the base and the opposite en'd'of It is to be understood' that my deviceis the guide for angularly adjusting and senot restrictedto use in connection with a curing the guide with respect to the base, athe, as any device for maintaining the and a tool support reciprocally mounted parts in proper relations to each other, subupon the guide. I 4o stantially as shown inFi 1, may be used. n testimony whereof I have hereunto y device may be mounted upon the brush subscribed my name this 31st day of Dec.,

in case the commutator and armature are FRANCIS S W ALTERS.

45 purpose I provide a hole 36 and a set screw Witnesses:

7 in the member 27.' W. J. KAUP, While I have shown and described a pre- B. B. HINES. 

